| /* |
| * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.debugger; |
| |
| import java.io.*; |
| import java.nio.*; |
| |
| /** Implementation of DataSource using MappedByteBuffer. This works |
| around a performance problem in JDK 1.4 where ByteBuffer's |
| operations always become virtual calls rather than being inlined. |
| Need to fix this soon. */ |
| |
| public class MappedByteBufferDataSource implements DataSource { |
| private MappedByteBuffer buf; |
| |
| public MappedByteBufferDataSource(MappedByteBuffer buf) { |
| this.buf = buf; |
| } |
| |
| public byte readByte() throws IOException { return buf.get(); } |
| public short readShort() throws IOException { return buf.getShort(); } |
| public int readInt() throws IOException { return buf.getInt(); } |
| public long readLong() throws IOException { return buf.getLong(); } |
| public int read(byte[] b) throws IOException { buf.get(b); return b.length; } |
| public void seek(long pos) throws IOException { |
| try { |
| buf.position((int) pos); |
| } catch (IllegalArgumentException e) { |
| System.err.println("Error seeking to file position 0x" + Long.toHexString(pos)); |
| throw(e); |
| } |
| } |
| public long getFilePointer() throws IOException { return buf.position(); } |
| public void close() throws IOException { buf = null; } |
| } |